When currency CHF is compared to currency BGN it is considered currency pair CHF/BGN , that is, today we need 1.99350 CHF/BGN to be able to have a CHF/BGN in our possession.
The term used to define CHF is base currency or transaction currencyand the BGN acts as a counter currency that can also be referred to as the quote currency.
Analyzing the evolution of the price in the last hours we can observe that the maximum price that this pair has reached has been 1.99690 while the minimum price has been 1.98920 so with a variation of 0.00450 we have a percentage difference of 0.22000%.